81 lines
3.0 KiB
C#
81 lines
3.0 KiB
C#
// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
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using System.Dynamic;
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using System.Web.WebPages.Resources;
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namespace System.Web.WebPages
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{
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internal class DynamicHttpApplicationState : DynamicObject
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{
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private HttpApplicationStateBase _state;
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public DynamicHttpApplicationState(HttpApplicationStateBase state)
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{
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_state = state;
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}
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public override bool TryGetMember(GetMemberBinder binder, out object result)
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{
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result = _state[binder.Name];
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// We return true here because HttpApplicationState returns null if the key is not
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// in the dictionary, so we simply pass on the returned value.
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return true;
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}
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public override bool TrySetMember(SetMemberBinder binder, object value)
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{
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_state[binder.Name] = value;
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return true;
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}
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public override bool TryGetIndex(GetIndexBinder binder, object[] indexes, out object result)
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{
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if (indexes == null || indexes.Length != 1)
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{
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throw new ArgumentException(WebPageResources.DynamicDictionary_InvalidNumberOfIndexes);
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}
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result = null;
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string key = indexes[0] as string;
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if (key != null)
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{
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result = _state[key];
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}
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else if (indexes[0] is int)
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{
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result = _state[(int)indexes[0]];
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}
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else
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{
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// HttpApplicationState only supports keys of type string and int when getting values, so any attempt
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// to use other types will result in an error. We throw an exception here to explain to the user what is wrong.
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// Returning false will instead cause a runtime binder exception which might be confusing to the user.
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throw new ArgumentException(WebPageResources.DynamicHttpApplicationState_UseOnlyStringOrIntToGet);
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}
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return true;
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}
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public override bool TrySetIndex(SetIndexBinder binder, object[] indexes, object value)
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{
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if (indexes == null || indexes.Length != 1)
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{
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throw new ArgumentException(WebPageResources.DynamicDictionary_InvalidNumberOfIndexes);
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}
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string key = indexes[0] as string;
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if (key != null)
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{
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_state[key] = value;
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return true;
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}
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else
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{
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// HttpApplicationState only supports keys of type string when setting values, so any attempt
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// to use other types will result in an error. We throw an exception here to explain to the user what is wrong.
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// Returning false will instead cause a runtime binder error which might be confusing to the user.
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throw new ArgumentException(WebPageResources.DynamicHttpApplicationState_UseOnlyStringToSet);
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}
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}
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}
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}
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